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<a name="1" href="#1">1</a>   <em class="comment">/*</em>
<a name="2" href="#2">2</a>   <em class="comment"> * $Header$</em>
<a name="3" href="#3">3</a>   <em class="comment"> * $Revision: 1128 $</em>
<a name="4" href="#4">4</a>   <em class="comment"> * $Date: 2006-02-05 13:49:04 -0800 (Sun, 05 Feb 2006) $</em>
<a name="5" href="#5">5</a>   <em class="comment"> *</em>
<a name="6" href="#6">6</a>   <em class="comment"> * ====================================================================</em>
<a name="7" href="#7">7</a>   <em class="comment"> *</em>
<a name="8" href="#8">8</a>   <em class="comment"> * Copyright 2000-2002 bob mcwhirter &amp; James Strachan.</em>
<a name="9" href="#9">9</a>   <em class="comment"> * All rights reserved.</em>
<a name="10" href="#10">10</a>  <em class="comment"> *</em>
<a name="11" href="#11">11</a>  <em class="comment"> * Redistribution and use in source and binary forms, with or without</em>
<a name="12" href="#12">12</a>  <em class="comment"> * modification, are permitted provided that the following conditions are</em>
<a name="13" href="#13">13</a>  <em class="comment"> * met:</em>
<a name="14" href="#14">14</a>  <em class="comment"> * </em>
<a name="15" href="#15">15</a>  <em class="comment"> *   * Redistributions of source code must retain the above copyright</em>
<a name="16" href="#16">16</a>  <em class="comment"> *     notice, this list of conditions and the following disclaimer.</em>
<a name="17" href="#17">17</a>  <em class="comment"> * </em>
<a name="18" href="#18">18</a>  <em class="comment"> *   * Redistributions in binary form must reproduce the above copyright</em>
<a name="19" href="#19">19</a>  <em class="comment"> *     notice, this list of conditions and the following disclaimer in the</em>
<a name="20" href="#20">20</a>  <em class="comment"> *     documentation and/or other materials provided with the distribution.</em>
<a name="21" href="#21">21</a>  <em class="comment"> * </em>
<a name="22" href="#22">22</a>  <em class="comment"> *   * Neither the name of the Jaxen Project nor the names of its</em>
<a name="23" href="#23">23</a>  <em class="comment"> *     contributors may be used to endorse or promote products derived </em>
<a name="24" href="#24">24</a>  <em class="comment"> *     from this software without specific prior written permission.</em>
<a name="25" href="#25">25</a>  <em class="comment"> * </em>
<a name="26" href="#26">26</a>  <em class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS</em>
<a name="27" href="#27">27</a>  <em class="comment"> * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED</em>
<a name="28" href="#28">28</a>  <em class="comment"> * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A</em>
<a name="29" href="#29">29</a>  <em class="comment"> * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER</em>
<a name="30" href="#30">30</a>  <em class="comment"> * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</em>
<a name="31" href="#31">31</a>  <em class="comment"> * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,</em>
<a name="32" href="#32">32</a>  <em class="comment"> * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR</em>
<a name="33" href="#33">33</a>  <em class="comment"> * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF</em>
<a name="34" href="#34">34</a>  <em class="comment"> * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</em>
<a name="35" href="#35">35</a>  <em class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</em>
<a name="36" href="#36">36</a>  <em class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</em>
<a name="37" href="#37">37</a>  <em class="comment"> *</em>
<a name="38" href="#38">38</a>  <em class="comment"> * ====================================================================</em>
<a name="39" href="#39">39</a>  <em class="comment"> * This software consists of voluntary contributions made by many </em>
<a name="40" href="#40">40</a>  <em class="comment"> * individuals on behalf of the Jaxen Project and was originally </em>
<a name="41" href="#41">41</a>  <em class="comment"> * created by bob mcwhirter &lt;bob@werken.com> and </em>
<a name="42" href="#42">42</a>  <em class="comment"> * James Strachan &lt;jstrachan@apache.org>.  For more information on the </em>
<a name="43" href="#43">43</a>  <em class="comment"> * Jaxen Project, please see &lt;<a href="http://www.jaxen.org/" target="alexandria_uri">http://www.jaxen.org/</a>>.</em>
<a name="44" href="#44">44</a>  <em class="comment"> * </em>
<a name="45" href="#45">45</a>  <em class="comment"> * $Id: StringFunction.java 1128 2006-02-05 21:49:04Z elharo $</em>
<a name="46" href="#46">46</a>  <em class="comment"> */</em>
<a name="47" href="#47">47</a>  
<a name="48" href="#48">48</a>  
<a name="49" href="#49">49</a>  <strong>package</strong> org.jaxen.function;
<a name="50" href="#50">50</a>  
<a name="51" href="#51">51</a>  <strong>import</strong> org.jaxen.Context;
<a name="52" href="#52">52</a>  <strong>import</strong> org.jaxen.Function;
<a name="53" href="#53">53</a>  <strong>import</strong> org.jaxen.FunctionCallException;
<a name="54" href="#54">54</a>  <strong>import</strong> org.jaxen.Navigator;
<a name="55" href="#55">55</a>  <strong>import</strong> org.jaxen.UnsupportedAxisException;
<a name="56" href="#56">56</a>  <strong>import</strong> org.jaxen.JaxenRuntimeException;
<a name="57" href="#57">57</a>  
<a name="58" href="#58">58</a>  <strong>import</strong> java.text.DecimalFormat;
<a name="59" href="#59">59</a>  <strong>import</strong> java.text.NumberFormat;
<a name="60" href="#60">60</a>  <strong>import</strong> java.text.DecimalFormatSymbols;
<a name="61" href="#61">61</a>  <strong>import</strong> java.util.List;
<a name="62" href="#62">62</a>  <strong>import</strong> java.util.Iterator;
<a name="63" href="#63">63</a>  <strong>import</strong> java.util.Locale;
<a name="64" href="#64">64</a>  
<a name="65" href="#65">65</a>  <em>/**</em>
<a name="66" href="#66">66</a>  <em> * &lt;p></em>
<a name="67" href="#67">67</a>  <em> * &lt;b>4.2&lt;/b> &lt;code>&lt;i>string&lt;/i> string(&lt;i>object&lt;/i>)&lt;/code></em>
<a name="68" href="#68">68</a>  <em> * &lt;/p></em>
<a name="69" href="#69">69</a>  <em> * </em>
<a name="70" href="#70">70</a>  <em> * </em>
<a name="71" href="#71">71</a>  <em> * &lt;blockquote src="<a href="http://www.w3.org/TR/xpath" target="alexandria_uri">http://www.w3.org/TR/xpath</a>"></em>
<a name="72" href="#72">72</a>  <em> * &lt;p></em>
<a name="73" href="#73">73</a>  <em> * The &lt;b>string&lt;/b> function converts</em>
<a name="74" href="#74">74</a>  <em> * an object to a string as follows:</em>
<a name="75" href="#75">75</a>  <em> * &lt;/p></em>
<a name="76" href="#76">76</a>  <em> * </em>
<a name="77" href="#77">77</a>  <em> * &lt;ul></em>
<a name="78" href="#78">78</a>  <em> * </em>
<a name="79" href="#79">79</a>  <em> * &lt;li></em>
<a name="80" href="#80">80</a>  <em> * &lt;p></em>
<a name="81" href="#81">81</a>  <em> * A node-set is converted to a string by returning the &lt;a</em>
<a name="82" href="#82">82</a>  <em> * href="<a href="http://www.w3.org/TR/xpath" target="alexandria_uri">http://www.w3.org/TR/xpath</a>#dt-string-value" target="_top">string-value&lt;/a> of the node in the node-set</em>
<a name="83" href="#83">83</a>  <em> * that is first in &lt;a href="<a href="http://www.w3.org/TR/xpath" target="alexandria_uri">http://www.w3.org/TR/xpath</a>#dt-document-order" target="_top">document order&lt;/a>. If</em>
<a name="84" href="#84">84</a>  <em> * the node-set is empty, an empty string is returned.</em>
<a name="85" href="#85">85</a>  <em> * &lt;/p></em>
<a name="86" href="#86">86</a>  <em> * &lt;/li></em>
<a name="87" href="#87">87</a>  <em> * </em>
<a name="88" href="#88">88</a>  <em> * &lt;li></em>
<a name="89" href="#89">89</a>  <em> * &lt;p></em>
<a name="90" href="#90">90</a>  <em> * A number is converted to a string as follows</em>
<a name="91" href="#91">91</a>  <em> * &lt;/p></em>
<a name="92" href="#92">92</a>  <em> * </em>
<a name="93" href="#93">93</a>  <em> * &lt;ul></em>
<a name="94" href="#94">94</a>  <em> * </em>
<a name="95" href="#95">95</a>  <em> * &lt;li></em>
<a name="96" href="#96">96</a>  <em> * &lt;p></em>
<a name="97" href="#97">97</a>  <em> * NaN is converted to the string &lt;code>NaN&lt;/code></em>
<a name="98" href="#98">98</a>  <em> * &lt;/p></em>
<a name="99" href="#99">99</a>  <em> * &lt;/li></em>
<a name="100" href="#100">100</a> <em> * </em>
<a name="101" href="#101">101</a> <em> * &lt;li></em>
<a name="102" href="#102">102</a> <em> * &lt;p></em>
<a name="103" href="#103">103</a> <em> * positive zero is converted to the string &lt;code>0&lt;/code></em>
<a name="104" href="#104">104</a> <em> * &lt;/p></em>
<a name="105" href="#105">105</a> <em> * &lt;/li></em>
<a name="106" href="#106">106</a> <em> * </em>
<a name="107" href="#107">107</a> <em> * &lt;li></em>
<a name="108" href="#108">108</a> <em> * </em>
<a name="109" href="#109">109</a> <em> * &lt;p></em>
<a name="110" href="#110">110</a> <em> * negative zero is converted to the string &lt;code>0&lt;/code></em>
<a name="111" href="#111">111</a> <em> * &lt;/p></em>
<a name="112" href="#112">112</a> <em> * &lt;/li></em>
<a name="113" href="#113">113</a> <em> * </em>
<a name="114" href="#114">114</a> <em> * &lt;li></em>
<a name="115" href="#115">115</a> <em> * &lt;p></em>
<a name="116" href="#116">116</a> <em> * positive infinity is converted to the string &lt;code>Infinity&lt;/code></em>
<a name="117" href="#117">117</a> <em> * &lt;/p></em>
<a name="118" href="#118">118</a> <em> * &lt;/li></em>
<a name="119" href="#119">119</a> <em> * </em>
<a name="120" href="#120">120</a> <em> * &lt;li></em>
<a name="121" href="#121">121</a> <em> * &lt;p></em>
<a name="122" href="#122">122</a> <em> * negative infinity is converted to the string &lt;code>-Infinity&lt;/code></em>
<a name="123" href="#123">123</a> <em> * </em>
<a name="124" href="#124">124</a> <em> * &lt;/p></em>
<a name="125" href="#125">125</a> <em> * &lt;/li></em>
<a name="126" href="#126">126</a> <em> * </em>
<a name="127" href="#127">127</a> <em> * &lt;li></em>
<a name="128" href="#128">128</a> <em> * &lt;p></em>
<a name="129" href="#129">129</a> <em> * if the number is an integer, the number is represented in decimal</em>
<a name="130" href="#130">130</a> <em> * form as a &lt;a href="<a href="http://www.w3.org/TR/xpath" target="alexandria_uri">http://www.w3.org/TR/xpath</a>#NT-Number" target="_top">Number&lt;/a> with no decimal point and</em>
<a name="131" href="#131">131</a> <em> * no leading zeros, preceded by a minus sign (&lt;code>-&lt;/code>) if</em>
<a name="132" href="#132">132</a> <em> * the number is negative</em>
<a name="133" href="#133">133</a> <em> * &lt;/p></em>
<a name="134" href="#134">134</a> <em> * &lt;/li></em>
<a name="135" href="#135">135</a> <em> * </em>
<a name="136" href="#136">136</a> <em> * &lt;li></em>
<a name="137" href="#137">137</a> <em> * &lt;p></em>
<a name="138" href="#138">138</a> <em> * otherwise, the number is represented in decimal form as a Number including a decimal point with at least</em>
<a name="139" href="#139">139</a> <em> * one digit before the decimal point and at least one digit after the</em>
<a name="140" href="#140">140</a> <em> * decimal point, preceded by a minus sign (&lt;code>-&lt;/code>) if the</em>
<a name="141" href="#141">141</a> <em> * number is negative; there must be no leading zeros before the decimal</em>
<a name="142" href="#142">142</a> <em> * point apart possibly from the one required digit immediately before</em>
<a name="143" href="#143">143</a> <em> * the decimal point; beyond the one required digit after the decimal</em>
<a name="144" href="#144">144</a> <em> * point there must be as many, but only as many, more digits as are</em>
<a name="145" href="#145">145</a> <em> * needed to uniquely distinguish the number from all other IEEE 754</em>
<a name="146" href="#146">146</a> <em> * numeric values.</em>
<a name="147" href="#147">147</a> <em> * &lt;/p></em>
<a name="148" href="#148">148</a> <em> * </em>
<a name="149" href="#149">149</a> <em> * &lt;/li></em>
<a name="150" href="#150">150</a> <em> * </em>
<a name="151" href="#151">151</a> <em> * &lt;/ul></em>
<a name="152" href="#152">152</a> <em> * </em>
<a name="153" href="#153">153</a> <em> * &lt;/li></em>
<a name="154" href="#154">154</a> <em> * </em>
<a name="155" href="#155">155</a> <em> * &lt;li></em>
<a name="156" href="#156">156</a> <em> * &lt;p></em>
<a name="157" href="#157">157</a> <em> * The boolean false value is converted to the string &lt;code>false&lt;/code>.</em>
<a name="158" href="#158">158</a> <em> * The boolean true value is converted to the string &lt;code>true&lt;/code>.</em>
<a name="159" href="#159">159</a> <em> * &lt;/p></em>
<a name="160" href="#160">160</a> <em> * &lt;/li></em>
<a name="161" href="#161">161</a> <em> * </em>
<a name="162" href="#162">162</a> <em> * &lt;li></em>
<a name="163" href="#163">163</a> <em> * &lt;p></em>
<a name="164" href="#164">164</a> <em> * An object of a type other than the four basic types is converted to a</em>
<a name="165" href="#165">165</a> <em> * string in a way that is dependent on that type.</em>
<a name="166" href="#166">166</a> <em> * &lt;/p></em>
<a name="167" href="#167">167</a> <em> * </em>
<a name="168" href="#168">168</a> <em> * &lt;/li></em>
<a name="169" href="#169">169</a> <em> * </em>
<a name="170" href="#170">170</a> <em> * &lt;/ul></em>
<a name="171" href="#171">171</a> <em> * </em>
<a name="172" href="#172">172</a> <em> * &lt;p></em>
<a name="173" href="#173">173</a> <em> * If the argument is omitted, it defaults to a node-set with the</em>
<a name="174" href="#174">174</a> <em> * context node as its only member.</em>
<a name="175" href="#175">175</a> <em> * &lt;/p></em>
<a name="176" href="#176">176</a> <em> * </em>
<a name="177" href="#177">177</a> <em> * &lt;/blockquote></em>
<a name="178" href="#178">178</a> <em> * </em>
<a name="179" href="#179">179</a> <em> * @author bob mcwhirter (bob @ werken.com)</em>
<a name="180" href="#180">180</a> <em> * @see &lt;a href="<a href="http://www.w3.org/TR/xpath" target="alexandria_uri">http://www.w3.org/TR/xpath</a>#function-string"</em>
<a name="181" href="#181">181</a> <em> *      target="_top">Section 4.2 of the XPath Specification&lt;/a></em>
<a name="182" href="#182">182</a> <em> */</em>
<a name="183" href="#183">183</a> <strong>public</strong> <strong>class</strong> <a href="../../../org/jaxen/function/StringFunction.html">StringFunction</a> implements <a href="../../../org/jaxen/Function.html">Function</a>
<a name="184" href="#184">184</a> {
<a name="185" href="#185">185</a> 
<a name="186" href="#186">186</a>     <strong>private</strong> <strong>static</strong> DecimalFormat format = (DecimalFormat) NumberFormat.getInstance(Locale.ENGLISH);
<a name="187" href="#187">187</a>     
<a name="188" href="#188">188</a>     <strong>static</strong> {
<a name="189" href="#189">189</a>         DecimalFormatSymbols symbols = <strong>new</strong> DecimalFormatSymbols(Locale.ENGLISH);
<a name="190" href="#190">190</a>         symbols.setNaN(<span class="string">"NaN"</span>);
<a name="191" href="#191">191</a>         symbols.setInfinity(<span class="string">"Infinity"</span>);
<a name="192" href="#192">192</a>         format.setGroupingUsed(false);
<a name="193" href="#193">193</a>         format.setMaximumFractionDigits(32);
<a name="194" href="#194">194</a>         format.setDecimalFormatSymbols(symbols);
<a name="195" href="#195">195</a>     }
<a name="196" href="#196">196</a> 
<a name="197" href="#197">197</a>     <em>/**</em>
<a name="198" href="#198">198</a> <em>     * Create a new &lt;code>StringFunction&lt;/code> object.</em>
<a name="199" href="#199">199</a> <em>     */</em>
<a name="200" href="#200">200</a>     <strong>public</strong> <a href="../../../org/jaxen/function/StringFunction.html">StringFunction</a>() {}
<a name="201" href="#201">201</a>     
<a name="202" href="#202">202</a>     <em>/**</em>
<a name="203" href="#203">203</a> <em>     * Returns the string-value of &lt;code>args.get(0)&lt;/code> </em>
<a name="204" href="#204">204</a> <em>     * or of the context node if &lt;code>args&lt;/code> is empty.</em>
<a name="205" href="#205">205</a> <em>     * </em>
<a name="206" href="#206">206</a> <em>     * @param context the context at the point in the</em>
<a name="207" href="#207">207</a> <em>     *         expression where the function is called</em>
<a name="208" href="#208">208</a> <em>     * @param args list with zero or one element</em>
<a name="209" href="#209">209</a> <em>     * </em>
<a name="210" href="#210">210</a> <em>     * @return a &lt;code>String&lt;/code> </em>
<a name="211" href="#211">211</a> <em>     * </em>
<a name="212" href="#212">212</a> <em>     * @throws FunctionCallException if &lt;code>args&lt;/code> has more than one item</em>
<a name="213" href="#213">213</a> <em>     */</em>    
<a name="214" href="#214">214</a>     <strong>public</strong> Object call(<a href="../../../org/jaxen/Context.html">Context</a> context,
<a name="215" href="#215">215</a>                        List args) throws FunctionCallException
<a name="216" href="#216">216</a>     {
<a name="217" href="#217">217</a>         <strong>int</strong> size = args.size();
<a name="218" href="#218">218</a> 
<a name="219" href="#219">219</a>         <strong>if</strong> ( size == 0 )
<a name="220" href="#220">220</a>         {
<a name="221" href="#221">221</a>             <strong>return</strong> evaluate( context.getNodeSet(),
<a name="222" href="#222">222</a>                              context.getNavigator() );
<a name="223" href="#223">223</a>         }
<a name="224" href="#224">224</a>         <strong>else</strong> <strong>if</strong> ( size == 1 )
<a name="225" href="#225">225</a>         {
<a name="226" href="#226">226</a>             <strong>return</strong> evaluate( args.get(0),
<a name="227" href="#227">227</a>                              context.getNavigator() );
<a name="228" href="#228">228</a>         }
<a name="229" href="#229">229</a> 
<a name="230" href="#230">230</a>         <strong>throw</strong> <strong>new</strong> <a href="../../../org/jaxen/FunctionCallException.html">FunctionCallException</a>( <span class="string">"string() takes at most argument."</span> );
<a name="231" href="#231">231</a>     }
<a name="232" href="#232">232</a>     
<a name="233" href="#233">233</a>     <em>/**</em>
<a name="234" href="#234">234</a> <em>     * Returns the XPath string-value of &lt;code>obj&lt;/code>.</em>
<a name="235" href="#235">235</a> <em>     * This operation is only defined if obj is a node, node-set,</em>
<a name="236" href="#236">236</a> <em>     * &lt;code>String&lt;/code>, &lt;code>Number&lt;/code>, or </em>
<a name="237" href="#237">237</a> <em>     * &lt;code>Boolean&lt;/code>. For other types this function</em>
<a name="238" href="#238">238</a> <em>     * returns the empty string. </em>
<a name="239" href="#239">239</a> <em>     * </em>
<a name="240" href="#240">240</a> <em>     * @param obj the node, node-set, string, number, or boolean</em>
<a name="241" href="#241">241</a> <em>     *      whose string-value is calculated</em>
<a name="242" href="#242">242</a> <em>     * @param nav the navigator used to calculate the string-value</em>
<a name="243" href="#243">243</a> <em>     * </em>
<a name="244" href="#244">244</a> <em>     * @return a &lt;code>String&lt;/code>. May be empty but is never null.</em>
<a name="245" href="#245">245</a> <em>     */</em>    
<a name="246" href="#246">246</a>     <strong>public</strong> <strong>static</strong> String evaluate(Object obj,
<a name="247" href="#247">247</a>                                   <a href="../../../org/jaxen/Navigator.html">Navigator</a> nav)
<a name="248" href="#248">248</a>     {
<a name="249" href="#249">249</a>         <strong>try</strong>
<a name="250" href="#250">250</a>         {
<a name="251" href="#251">251</a>             <em class="comment">// Workaround because XOM uses lists for Text nodes</em>
<a name="252" href="#252">252</a>             <em class="comment">// so we need to check for that first</em>
<a name="253" href="#253">253</a>             <strong>if</strong> (nav != <strong>null</strong> &amp;&amp; nav.isText(obj))
<a name="254" href="#254">254</a>             {
<a name="255" href="#255">255</a>                 <strong>return</strong> nav.getTextStringValue(obj);
<a name="256" href="#256">256</a>             }
<a name="257" href="#257">257</a>             
<a name="258" href="#258">258</a>             <strong>if</strong> (obj instanceof List)
<a name="259" href="#259">259</a>             {
<a name="260" href="#260">260</a>                 List list = (List) obj;
<a name="261" href="#261">261</a>                 <strong>if</strong> (list.isEmpty())
<a name="262" href="#262">262</a>                 {
<a name="263" href="#263">263</a>                     <strong>return</strong> <span class="string">""</span>;
<a name="264" href="#264">264</a>                 }
<a name="265" href="#265">265</a>                 <em class="comment">// do not recurse: only first list should unwrap</em>
<a name="266" href="#266">266</a>                 obj = list.get(0);
<a name="267" href="#267">267</a>             }
<a name="268" href="#268">268</a>             
<a name="269" href="#269">269</a>             <strong>if</strong> (nav != <strong>null</strong>) {
<a name="270" href="#270">270</a>                 <em class="comment">// This stack of instanceof really suggests there's </em>
<a name="271" href="#271">271</a>                 <em class="comment">// a failure to take advantage of polymorphism here</em>
<a name="272" href="#272">272</a>                 <strong>if</strong> (nav.isElement(obj))
<a name="273" href="#273">273</a>                 {
<a name="274" href="#274">274</a>                     <strong>return</strong> nav.getElementStringValue(obj);
<a name="275" href="#275">275</a>                 }
<a name="276" href="#276">276</a>                 <strong>else</strong> <strong>if</strong> (nav.isAttribute(obj))
<a name="277" href="#277">277</a>                 {
<a name="278" href="#278">278</a>                     <strong>return</strong> nav.getAttributeStringValue(obj);
<a name="279" href="#279">279</a>                 }
<a name="280" href="#280">280</a>     
<a name="281" href="#281">281</a>                 <strong>else</strong> <strong>if</strong> (nav.isDocument(obj))
<a name="282" href="#282">282</a>                 {
<a name="283" href="#283">283</a>                     Iterator childAxisIterator = nav.getChildAxisIterator(obj);
<a name="284" href="#284">284</a>                     <strong>while</strong> (childAxisIterator.hasNext())
<a name="285" href="#285">285</a>                     {
<a name="286" href="#286">286</a>                         Object descendant = childAxisIterator.next();
<a name="287" href="#287">287</a>                         <strong>if</strong> (nav.isElement(descendant))
<a name="288" href="#288">288</a>                         {
<a name="289" href="#289">289</a>                             <strong>return</strong> nav.getElementStringValue(descendant);
<a name="290" href="#290">290</a>                         }
<a name="291" href="#291">291</a>                     }
<a name="292" href="#292">292</a>                 }
<a name="293" href="#293">293</a>                 <strong>else</strong> <strong>if</strong> (nav.isProcessingInstruction(obj))
<a name="294" href="#294">294</a>                 {
<a name="295" href="#295">295</a>                     <strong>return</strong> nav.getProcessingInstructionData(obj);
<a name="296" href="#296">296</a>                 }
<a name="297" href="#297">297</a>                 <strong>else</strong> <strong>if</strong> (nav.isComment(obj))
<a name="298" href="#298">298</a>                 {
<a name="299" href="#299">299</a>                     <strong>return</strong> nav.getCommentStringValue(obj);
<a name="300" href="#300">300</a>                 }
<a name="301" href="#301">301</a>                 <strong>else</strong> <strong>if</strong> (nav.isText(obj))
<a name="302" href="#302">302</a>                 {
<a name="303" href="#303">303</a>                     <strong>return</strong> nav.getTextStringValue(obj);
<a name="304" href="#304">304</a>                 }
<a name="305" href="#305">305</a>                 <strong>else</strong> <strong>if</strong> (nav.isNamespace(obj))
<a name="306" href="#306">306</a>                 {
<a name="307" href="#307">307</a>                     <strong>return</strong> nav.getNamespaceStringValue(obj);
<a name="308" href="#308">308</a>                 }
<a name="309" href="#309">309</a>             }
<a name="310" href="#310">310</a>             
<a name="311" href="#311">311</a>             <strong>if</strong> (obj instanceof String)
<a name="312" href="#312">312</a>             {
<a name="313" href="#313">313</a>                 <strong>return</strong> (String) obj;
<a name="314" href="#314">314</a>             }
<a name="315" href="#315">315</a>             <strong>else</strong> <strong>if</strong> (obj instanceof Boolean)
<a name="316" href="#316">316</a>             {
<a name="317" href="#317">317</a>                 <strong>return</strong> stringValue(((Boolean) obj).booleanValue());
<a name="318" href="#318">318</a>             }
<a name="319" href="#319">319</a>             <strong>else</strong> <strong>if</strong> (obj instanceof Number)
<a name="320" href="#320">320</a>             {
<a name="321" href="#321">321</a>                 <strong>return</strong> stringValue(((Number) obj).doubleValue());
<a name="322" href="#322">322</a>             }
<a name="323" href="#323">323</a>             
<a name="324" href="#324">324</a>         }
<a name="325" href="#325">325</a>         <strong>catch</strong> (UnsupportedAxisException e)
<a name="326" href="#326">326</a>         {
<a name="327" href="#327">327</a>             <strong>throw</strong> <strong>new</strong> <a href="../../../org/jaxen/JaxenRuntimeException.html">JaxenRuntimeException</a>(e);
<a name="328" href="#328">328</a>         }
<a name="329" href="#329">329</a>         
<a name="330" href="#330">330</a>         <strong>return</strong> <span class="string">""</span>;
<a name="331" href="#331">331</a> 
<a name="332" href="#332">332</a>     }
<a name="333" href="#333">333</a> 
<a name="334" href="#334">334</a>     <strong>private</strong> <strong>static</strong> String stringValue(<strong>double</strong> value)
<a name="335" href="#335">335</a>     {
<a name="336" href="#336">336</a>         
<a name="337" href="#337">337</a>         <em class="comment">// DecimalFormat formats negative zero as "-0".</em>
<a name="338" href="#338">338</a>         <em class="comment">// Therefore we need to test for zero explicitly here.</em>
<a name="339" href="#339">339</a>         <strong>if</strong> (value == 0) <strong>return</strong> <span class="string">"0"</span>;
<a name="340" href="#340">340</a>         
<a name="341" href="#341">341</a>         <em class="comment">// need to synchronize object for thread-safety</em>
<a name="342" href="#342">342</a>         String result = <strong>null</strong>;
<a name="343" href="#343">343</a>         <strong>synchronized</strong> (format) {
<a name="344" href="#344">344</a>             result = format.format(value);
<a name="345" href="#345">345</a>         }
<a name="346" href="#346">346</a>         <strong>return</strong> result;
<a name="347" href="#347">347</a>         
<a name="348" href="#348">348</a>     }
<a name="349" href="#349">349</a> 
<a name="350" href="#350">350</a>     <strong>private</strong> <strong>static</strong> String stringValue(<strong>boolean</strong> value)
<a name="351" href="#351">351</a>     {
<a name="352" href="#352">352</a>         <strong>return</strong> value ? <span class="string">"true"</span> : <span class="string">"false"</span>;
<a name="353" href="#353">353</a>     }
<a name="354" href="#354">354</a> 
<a name="355" href="#355">355</a> }
</pre>
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